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(No Model.) 2 Sheets-Sheet 1. J. B. MARTIN.

DUST ARRESTER. No. 431,951. I Patented July 8, 1890.

WITNESSES INVE OR Byhis flttorneys JamesflB' ariln m: mums PETERS (20., PNOlD-UTHG,, msummon, a c

(No Model.) 2 Sheets-:Sheet 2.

J. B. MARTIN DUST ARRESTER.

No. 431,951. Patented July 8, 1890.

WITNESSES I INVENTOR 22 James .B. Marlin, 7%, W Byhes Attorneys UNITED STATES PATENT OFFICE.

JAMES B. MARTIN, OF GRAND RAPIDS, MICHIGAN, ASSIGNOR TO MARTINS IWIIDDLINGS PURIFIER COMPANY, OF SAME PLACE.

DUST-ARRESTER.

SPECIFICATION forming part of Letters Patent No. 431,951, dated July 8, 1890.

Application filed October 19, 1887.. Serial No. 252,838. (No model.)

To all whom it may concern.-

Be it known that I, JAMES B. MARTIN, of Grand Rapids, in the county of Kent and State of Michigan, have invented certain new 5 and useful Improvements in Dust-Arresters,

of which the following is a specification, reference being had to the accompanying drawings.

My invention is designed to be used in connection wi th middlings-purifiers, wheat-cleaning machines, blast-fans from wood-working machinery, or any fan-blast machine for-the purpose of separating dust or any floating particles of solid matter from air, which dust I or solid matter is blown or carried in air-currents by fan-blast or suction.

My invention consists in certain improvements made up of certain mechanical organ izations of parts, which I will now proceed to describe in detail and then define succinctly in my claims.

In the accompanying drawings, illustrating my invention, Figure 1 is a front elevation in mere outline of my improved dust-arrester.

Fig. 2 is a central vertical section of Fig. 1. Fig. 3 is a top or plan view partly broken away. Fig. 4 is a view of the inner hopper and dust-trap detached. Fig. 5 is a crosssection of the dust-trap 011 the line 5 of Fig. 4:.

Referring to the letters upon the drawings, A designates the main supporting-frame, of any suitable form or material.

B designates an outer ease supported in the main frame, of cylindrical form at its upper 5 part and of conical form at its lower part. 0 designates an inner case of similar form, supported through the instrumentality of small studs b or similar fastening-connections by the outer case.

D designates a central tube, through which the pure air is discharged upward after the dust and floating matter have been separated from it.

E designates a spiral shelf or flange ex- 5 tending around the outside of and supported by the tube D. The purpose of this spiral flange or shelf is to cause the air-currents entering the opening at X to receive a circular downward movement and to impinge against the inner surface of the case B, so that much of the dust and solid particles shall be driven outward against the case and down through the passage F, between the inner and outer cases, to the point of discharge G, where they will pass out of the machine. So much of the '55 dust-laden air as is discharged from the spiral passage within the case 0 is deflected outward as it passes down by the inclined circular collar or flange H, which projects out from the tube D. The result is that the main 5o portion of the remaining dust and solid particles not discharged through the passage F is driven down to the point of discharge and is conveyed out of the machine. The air thus purified will pass upward by reaction from the dead-air chamber F and seek an outlet through the upper part of the tube D. In order to enter this tube, it must pass through the peculiar dust-trap I. This trap is composed of the curved vertical partitions K, provided at their inner edges with vertical angular dust-catching flanges or obstructions L, against which the incoming currents of air and dust strike. The openings between these partitions at the top are all closed by a partition or covering M, while at the bottom they are all open, so that as the dust strikes against the partitions and their flanges it will be carried downward by gravity into the funnel N and delivered at the point of discharge. The partitions K are arranged with their air-inlet openings so that the air in entering the spaces between them on its way into the tube D must have its direction reversed. In that way its velocity is diminished and it is obstructed and detained in its efforts to escape, so that the dust remaining as it enters between the partitions K is thoroughly removed and falls down into the funnel N, as above stated, and the pure air escapes through the opening in 0 the upper end of the tube D.

O designates a shaft ext-ending from the cross-piece P of the open cover Q of the machine down to and connecting with a screwconveyer R at the point of discharge. S des- 5 ignatesafan secured to this shaft. The force of the upwardly-escaping air rotates this fan and the shaft and screw conveyor at the point of discharge, so that the dust is forced out of the machine by the power of the air, which enters and finally escapes upward from the machine in a purified condition.

Instead of a single inner case and passage between it and the outer case, there might be several, as indicated by dotted lines in Fig. 1. This simple apparatus as illustrated, however, operates with great efficiency to separate dust and solid particles of matter from currents of air, and some of the parts might be omitted-for example, the fan and the screw conveyer and their shaft, because without any screw conveyer and with the open ings above and below very good results might be obtained; but I prefer to use them generally. Again, without the peculiar dust-trap I, but with simply openings into the tube D for the escape of the purified air, very good results might be obtained; but I prefer to use the dust-trap.

Having described my improved dust-arrester, what I claim to be new therein, and desire to secure by Letters Patent of the United States, is-

1. The combination of the supportingframe, the outer casing B, having an entranceopening, the casing O, arranged Within the casing B so as to leave a passage F between the inner and outer cases, and the spiral shelf E, leading from the opening in the casing B to the interior of the casing O, substantially as set forth.

2. The combination of the outer casing B, having an entrance-openin g, the inner casing C, the spiral shelf E, leading from the entrance-opening to the interior of the casing C, the dust-trap I within the inner casing, and the tube D above the dust-trap, substantially as set forth.

3. The combination of the outer casing 13, having an entrance-opening, the inner casin g (J, the spiral shelf E, leading from the entrance-opening to the interior of the casing O, and the inclined circular collar I-I, arranged below the shelf E, substantially as set forth.

4. The combination of the outer casing B, having'an entrance-opening, the casing 0,

arranged within the casing B, the spiral shelf E, leading from the entrance-opening to the interior of the casing O, and the dust-trap I,

. substantially as set forth.

In testimony whereof I have hereunto subscribed my name.

JAMES B. MARTIN. IVitnesses:

W. OURTIss, FRANK A. RICHARDS. 

